EP0451567A2 - Procédé et dispositif pour la détermination du degré de corrosion des éléments métalliques - Google Patents

Procédé et dispositif pour la détermination du degré de corrosion des éléments métalliques Download PDF

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Publication number
EP0451567A2
EP0451567A2 EP91104401A EP91104401A EP0451567A2 EP 0451567 A2 EP0451567 A2 EP 0451567A2 EP 91104401 A EP91104401 A EP 91104401A EP 91104401 A EP91104401 A EP 91104401A EP 0451567 A2 EP0451567 A2 EP 0451567A2
Authority
EP
European Patent Office
Prior art keywords
metal parts
gas
reactive gas
carrier gas
corrosion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91104401A
Other languages
German (de)
English (en)
Other versions
EP0451567B1 (fr
EP0451567A3 (en
Inventor
Stephan Dr. Rer.Nat. Haupt
Claus Dieter Breede
Wolfgang Falb
Carl F. Dr. Wallroth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Draegerwerk AG and Co KGaA
Original Assignee
Draegerwerk AG and Co KGaA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Draegerwerk AG and Co KGaA filed Critical Draegerwerk AG and Co KGaA
Publication of EP0451567A2 publication Critical patent/EP0451567A2/fr
Publication of EP0451567A3 publication Critical patent/EP0451567A3/de
Application granted granted Critical
Publication of EP0451567B1 publication Critical patent/EP0451567B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light

Definitions

  • the invention relates to a method for determining the degree of corrosion of metal parts, in particular cavities in these parts, and a device for performing this method.
  • the function can be impaired by corrosion on the metallic surfaces that come into contact with the aggressive media.
  • the object of the invention is to provide a method and an apparatus for carrying out this method, which enables a quick and reliable assessment of the degree of corrosion of metal parts without these parts being visually accessible or having to be removed, the functional parts being able to be left in an operational state .
  • the object is achieved in that the metal parts are exposed to an atmosphere sealed off from the environment from an inert carrier gas with the addition of a chemical and / or physical reaction which reacts only with the corrosion products formed on the surfaces of the metal parts, and in that the difference between the amount of reactive gas fed to the metal parts and the amount withdrawn again from the metal parts.
  • the advantage of the method is that the device can be checked without disassembly.
  • the reactive gas penetrates all cavities to be examined. After the reactive gas has been flushed out, the device is immediately ready for use again without any assembly or adjustment work.
  • the costs and the time required for the service are thus considerably reduced compared to an optical inspection. By flushing even hidden cavities, those surface areas are also detected that are inaccessible for an optical inspection.
  • reactive gases depending on the type of metal to be examined, e.g. B. hydrogen sulfide (H2S) for iron and ammonia (NH3) for brass can be used as a carrier gas z. B. air related.
  • the reactive gas is capable of chemical reactions with the corrosion products it is intended to detect, so it is depleted in the carrier gas stream upon contact with these corrosion products. Physical reactions such as solution in liquids or adsorption on surfaces can also contribute to depletion.
  • the reactive gas is preferably stored in solution in a liquid and used in a test device.
  • ammonia dissolved in water is easy to obtain and store until use, which would cause more problems with gaseous ammonia.
  • the metering of the reactive gas via a permeable membrane simultaneously enables separation of the reactive gas from the liquid and unproblematic supply of the smallest amounts of the reactive gas to the carrier gas.
  • a suitable test tube is particularly suitable as a sensor for the reactive gas, since it is capable of detecting the smallest traces of gas and at the same time is cheap and robust.
  • the invention is described on the basis of the description of an exemplary embodiment of a device for carrying out the method according to the invention.
  • Such a device is shown schematically in the single figure of the drawing.
  • Compressed air as carrier gas from a compressed air source enters the test device (2) via the carrier gas inlet (1).
  • the compressed air arrives in a pressure reducer (3), at the outlet (4) of which a defined carrier gas pressure is present.
  • a defined carrier gas volume flow is generated via an adjustable metering throttle (5) and can be determined by means of a measuring tube (6).
  • the carrier gas then flows through a first chamber (7) of a metering device (8).
  • the reactive gas dissolved in a liquid, in this example ammonia in water is located in a second chamber (9) of the metering device (8).
  • the two chambers (7, 9) are separated by a membrane (10) which is permeable to the gas but impermeable to the liquid.
  • a small amount of the reactive gas is thus added to the carrier gas through the membrane (10).
  • an air flow of 50 to 500 ml / min serving as carrier gas is mixed with 10 to 200 ppm ammonia.
  • the gas mixture passes through a first line (11) into the cavities of a device (12) to be examined.
  • the gas is returned to the test device (2) via a return line (13).
  • the gas flows through a test tube (14) sensitive to the reactive gas and then escapes via a line (15) into the open or into a suitable device for gas transmission.
  • the line (11) is first connected to the return line (13) and the gas flow is started for about a minute.
  • the gas flowing through changes in its No composition and the amount of reactive gas added to the carrier gas by means of the metering device (8) can be read from the test tube (14) on the first graduation marks.
  • the device (12) To check the device (12) for corrosion, it is now connected with its input (16) to the line (11) and with its output (17) to the return line (13). The gas flows through the functional areas of the device (12). In these functional rooms there are brass parts that can show signs of corrosion due to the action of halogenated hydrocarbons. If this is the case, the ammonia contained in the carrier gas reacts with the corrosion products and is thus depleted in the gas stream returned from the device (12) to the test device (2). If the device is corroded so that its function could be impaired in the foreseeable future, i.e. a major overhaul is necessary, the ammonia is so depleted that it can only be detected on the test tube (14) after a flow time of several minutes. If the device is uncorroded, the ammonia can be detected very shortly after the start of flow. Therefore, a very safe and unambiguous statement about the corrosion status of the device is possible. After flushing with clean air, it is immediately ready for use again.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
EP91104401A 1990-04-12 1991-03-21 Procédé et dispositif pour la détermination du degré de corrosion des éléments métalliques Expired - Lifetime EP0451567B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4011785A DE4011785C1 (en) 1990-04-12 1990-04-12 Determining metal corrosion - by exposing metal part to confined atmos. of inert carrier gas, adding reactive gas for chemical reaction etc.
DE4011785 1990-04-12

Publications (3)

Publication Number Publication Date
EP0451567A2 true EP0451567A2 (fr) 1991-10-16
EP0451567A3 EP0451567A3 (en) 1992-01-22
EP0451567B1 EP0451567B1 (fr) 1994-06-01

Family

ID=6404238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91104401A Expired - Lifetime EP0451567B1 (fr) 1990-04-12 1991-03-21 Procédé et dispositif pour la détermination du degré de corrosion des éléments métalliques

Country Status (2)

Country Link
EP (1) EP0451567B1 (fr)
DE (2) DE4011785C1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2141643C1 (ru) * 1996-04-16 1999-11-20 Петров Валентин Алексеевич Способ определения ресурса металла при коррозии под механическим напряжением
RU2195643C1 (ru) * 2001-09-20 2002-12-27 Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики Способ контроля коррозии металлического урана
RU2235309C1 (ru) * 2003-12-03 2004-08-27 ООО "Самарский инженерно-технический центр" Способ коррозионных испытаний сталей
RU2483292C2 (ru) * 2011-08-17 2013-05-27 Федеральное государственное унитарное предприятие "Российский федеральный ядерный центр - Всероссийский научно-исследовательский институт технической физики имени академика Е.И. Забабахина" Установка для испытаний металлического урана

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2361709A1 (de) * 1973-12-12 1975-06-26 Volkswagenwerk Ag Einrichtung zu korrosionstestzwecken
DE2611050A1 (de) * 1976-03-16 1977-09-29 Siemens Ag Pruefvorrichtung fuer korrosionspruefungen mit aggressiven gasen
FR2355285A1 (fr) * 1976-06-18 1978-01-13 Coprelec Procede et dispositifs de detection de la corrosion sur des pieces ou ensembles de pieces metalliques enterrees, notamment sur des canalisations
DE3720686A1 (de) * 1987-06-23 1989-01-05 Foerster Inst Dr Friedrich Verfahren zum untersuchen eines objektes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2141643C1 (ru) * 1996-04-16 1999-11-20 Петров Валентин Алексеевич Способ определения ресурса металла при коррозии под механическим напряжением
RU2195643C1 (ru) * 2001-09-20 2002-12-27 Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики Способ контроля коррозии металлического урана
RU2235309C1 (ru) * 2003-12-03 2004-08-27 ООО "Самарский инженерно-технический центр" Способ коррозионных испытаний сталей
RU2483292C2 (ru) * 2011-08-17 2013-05-27 Федеральное государственное унитарное предприятие "Российский федеральный ядерный центр - Всероссийский научно-исследовательский институт технической физики имени академика Е.И. Забабахина" Установка для испытаний металлического урана

Also Published As

Publication number Publication date
EP0451567B1 (fr) 1994-06-01
EP0451567A3 (en) 1992-01-22
DE59101756D1 (de) 1994-07-07
DE4011785C1 (en) 1991-08-08

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